Sporting fish seen around Noah's ship (7)
I believe the answer is:
larking
'sporting' is the definition.
('lark' can be a synonym of 'sport')
'fish seen around noah's ship' is the wordplay.
'fish' becomes 'ling' (ling is a kind of fish).
'seen around' is an insertion indicator.
'noah's ship' becomes 'ark' (Noah's ark in the Bible).
'ling' going around 'ark' is 'LARKING'.
(Other definitions for larking that I've seen before include "Frolicking like a bird" , "hunting for birds" , "having fun" .)